gpg: Fix "generate" command in --card-edit.

* g10/card-util.c (get_info_for_key_operation): Get the APPTYPE before
testing for it.
* g10/card-util.c (current_card_status): Always try to update the
shadow keys.
* g10/call-agent.c (agent_scd_getattr): Handle $AUTHKEYID.

The first part fixed a regression introduced today.

The second part is usually not required because our ssh-agent code
anyway looks for the OpenPGP.3 key. However, this helps to put the
Display S/N into the shadow key so that we get a better prompt to
insert the card.

• GnuPG-bug-id: T5100